Question

While we were taking our dinner, somebody ____ the door

Answer 1

While we were taking our dinner, somebody knocked on the door.

Explanation:

• The correct form of the verb must be used to show the tense of the sentence.

• The form of the verb depends on the word that is before the verb and the subject of the sentence and the tense.

• The second form of the verb is mostly used in the Past tenses, whereas the first forms of the verb are used in Present tenses.

• On is added here as a preposition.

• Prepositions and post positions, combined known as ad-positions, are a group of words used to depict spatial or temporal relations or mark different semantic roles.

• Prepositions show relationships between other words in a statement.

Answer 2

Fill in the blanks:

While we were taking our dinner, somebody knocked the door.

Explanation:

• The word is verb in this sentence which defines the action of the subject.  It is used in three tenses namely past, present and future.
• The word knock means striking noisily on the surface to attract attention.
• The first half of the given sentence is the first action and another half is second action.
• Since, the first action is in past form, the second action will also be in past form.